Bootlegger Johnny Franks recruits a crude working man called Louis “Slaughterhouse” Scorpio as part of the gang of mob boss and lawyer Richard “Newt” Newton. Scorpio eventually becomes head of the organization himself. Then he is prosecuted by a secret group of six masked crime fighters, aided by newspaper reporters Carl Luckner and Hank Rogers. More on Wikipedia or Mubi
Watch The Secret Six (1931)